On the play screen click
Sub Menu > Tokenz
A lottery wheel will show up. There are 3 different wheels, bronze, silver, and gold. You can spin each wheel 1 time with its corresponding token. Or you can use the option to spin 100 of one type of token to be guaranteed to get a Collector card from that wheel.
The Cr's (Collectors) you get at each level differ. The ones from the bronze wheel can be really cheap ones, or up to cards like Jane Ramba Cr.